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The value of x fot which the angle betwe...

The value of x fot which the angle between the vectors `a=-3hat(i)+xhat(j)+hat(k) and b=xhat(i)+2xhat(j)+hat(k)` is acute and the angle between b and X-axis lies between `(pi)/(2) and pi` satisfy.

A

`-1`

B

`x gt 0`

C

1

D

`x lt 0`

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The correct Answer is:
D
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